1 files changed, 40 insertions, 0 deletions
diff --git a/source/getSum.c b/source/getSum.c
new file mode 100644
index 0000000..6d600ae
--- /dev/null
+++ b/source/getSum.c
@@ -0,0 +1,40 @@
+/*
+	Copyright 2022-2023 Gabriel Bjørnager Jensen.
+
+	This file is part of agbsum.
+
+	agbsum is free software: you can redistribute it
+	and/or modify it under the terms of the GNU
+	Affero General Public License as published by
+	the Free Software Foundation, either version 3
+	of the License, or (at your option) any later
+	version.
+
+	agbsum is distributed in the hope that it will
+	be useful, but WITHOUT ANY WARRANTY; without
+	even the implied warranty of MERCHANTABILITY
+	or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU Affero General Public License for more
+	details.
+
+	You should have received a copy of the GNU
+	Affero General Public License along with agbsum.
+	If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <agbsum.h>
+
+#include <stdint.h>
+
+uint8_t
+agb_getSum (void const* const restrict imagePtr)
+{
+	uint8_t const* restrict image = imagePtr;
+	uint8_t                 sum   = UINT8_C(0x0);
+
+	for (char unsigned const* restrict position = image; position != image + agb_sumOffset; ++position) { sum += *position; }
+
+	sum = -(UINT8_C(0x19) + sum);
+
+	return sum;
+}